public function testPluck()
{
$a = function () {
(yield ['a' => 1, 'b' => 2]);
(yield ['a' => 3, 'b' => 4]);
};
$b1 = [1, 2, 3];
$b2 = [4, 5, 6];
$this->assertEquals([2, 4], P::toArray(P::pluck('b', $a())));
$this->assertEquals([2, 5], P::toArray(P::pluck(1, [$b1, $b2])));
}
